Alkylation process unit comprising a fractionation unit for separating hydrogen gas and hydrogen chloride

• US 9,254,450 B2
• Filed: 01/17/2014
• Issued: 02/09/2016
• Est. Priority Date: 07/31/2012
• Status: Active Grant

• Current Assignee: Chevron USA Incorporated (Chevron Corp.)
• Original Assignee: Chevron USA Incorporated (Chevron Corp.)
• Inventors: Timken, Hye Kyung Cho, Cleverdon, Robert Fletcher, Chang, Bong-Ku, Mohr, Donald Henry, Phillips, Christine Marie
• Primary Examiner(s): YOUNG, NATASHA E
• Application Number:
  US14/157,968
• Publication Number:
  US 20140134065A1
• Time in Patent Office: 753 Days
• US Class Current: 1/1
• CPC Class Codes: B01D 3/009 in combination with chemical reactions
• CPC Class Codes: B01J 2231/32 Addition reactions to C=C or C-C triple bonds
• CPC Class Codes: B01J 31/0277 comprising ionic liquids, as components in catalyst systems or catalysts per se, the ionic liquid compounds being used in the molten state at the respective reaction temperature
• CPC Class Codes: B01J 31/0281 the nitrogen being a ring member
• CPC Class Codes: C07C 2/58 Catalytic processes
• CPC Class Codes: C07C 5/02 by hydrogenation simultaneous hydrogenation and dehydrogenation C07C5/52
• CPC Class Codes: C10G 29/205 by reaction with hydrocarbons added to the hydrocarbon oil
• CPC Class Codes: Y02P 20/584 Recycling of catalysts

Abstract

We provide an alkylation process, comprising: separating and recycling a hydrogen gas and a hydrogen chloride from an offgas of a hydrogenation reactor; wherein the hydrogen gas is recycled to the hydrogenation reactor; and wherein the hydrogen chloride is recycled to an alkylation reactor. We also provide an alkylation process unit for performing this process.

Claims

1. An alkylation process unit, comprising:

a. a fractionation unit (200) for separating a hydrogen gas and a hydrogen chloride from an offgas (50) of a hydrogenation reactor (100) that regenerates a used ionic liquid catalyst; and

b. a first connection between the fractionation unit (200) and the hydrogenation reactor (100) for transmitting at least a portion comprising the hydrogen gas to the hydrogenation reactor (100);

c. a second connection between the fractionation unit (200) and an alkylation reactor (300) to transmit at least a second portion comprising the hydrogen chloride to the alkylation reactor (300); and

d. an inlet wherein a hydrocarbon extraction solvent (25) is fed to the fractionation unit (200) or to a separator (400) that is located between the hydrogenation reactor (100) and the fractionation unit (200).

2. The alkylation process unit of claim 1, wherein the fractionation unit (200) is a distillation column.

3. The alkylation process unit of claim 1, wherein the inlet is at a location above where the hydrogen gas and the hydrogen chloride are fed to the fractionation unit (200).

4. The alkylation process unit of claim 1, wherein the hydrocarbon extraction solvent (25) is fed to the separator (400).

5. The alkylation process unit of claim 1, wherein the hydrogenation reactor (100) comprises a hydrogenation catalyst containing Pt and Pd.

6. The alkylation process unit of claim 1, wherein the used ionic liquid catalyst is a chloroaluminate ionic liquid catalyst.

7. The alkylation process unit of claim 1, additionally comprising an ionic liquid catalyst and hydrocarbon separator (500) which separates the offgas (50) into a light hydrocarbon fraction comprising the hydrogen chloride (30), an extracted conjunct polymer naphtha (45), and an ionic liquid catalyst stream (60).

8. The alkylation process unit of claim 1, additionally comprising a third connection between a product treatment unit and the second connection, wherein the second portion is mixed with a recycled stream, from the product treatment unit, comprising a mixture of a gaseous hydrogen chloride and a propane.

9. The alkylation process unit of claim 1, wherein the hydrocarbon extraction solvent (25) is fed to the fractionation unit (200).

10. An alkylation process unit, comprising:

a. a fractionation unit (200) for separating a hydrogen gas and a hydrogen chloride from an offgas (50) of a hydrogenation reactor (100) that regenerates a used ionic liquid catalyst; and

b. a first connection between the fractionation unit (200) and the hydrogenation reactor (100) for transmitting at least a portion comprising the hydrogen gas to the hydrogenation reactor (100);

c. a second connection between the fractionation unit (200) and an alkylation reactor (300) to transmit at least a second portion comprising the hydrogen chloride to the alkylation reactor (300); and

d. a third connection between a product treatment unit and the second connection, wherein the second portion is mixed with a recycled stream, from the product treatment unit, comprising a mixture of a gaseous hydrogen chloride and a propane.

11. The alkylation process unit of claim 10, wherein the fractionation unit (200) is a distillation column.

12. The alkylation process unit of claim 10, additionally comprising an inlet wherein a hydrocarbon extraction solvent (25) is fed to the fractionation unit (200) or to a separator (400) that is located between the hydrogenation reactor (100) and the fractionation unit (200).

13. The alkylation process unit of claim 12, wherein the inlet is at a location above where the hydrogen gas and the hydrogen chloride are fed to the fractionation unit (200).

14. The alkylation process unit of claim 10, additionally comprising a separator (400) between the hydrogenation reactor (100) and the fractionation unit (200).

15. The alkylation process unit of claim 10, wherein the hydrogenation reactor (100) comprises a hydrogenation catalyst containing Pt and Pd.

16. The alkylation process unit of claim 10, wherein the used ionic liquid catalyst is a chloroaluminate ionic liquid catalyst.

17. The alkylation process unit of claim 10, additionally comprising an ionic liquid catalyst and hydrocarbon separator (500) which separates the offgas (50) into a light hydrocarbon fraction comprising the hydrogen chloride (30), an extracted conjunct polymer naphtha (45), and an ionic liquid catalyst stream (60).